Wizardkind is the collective term for those who are capable of using magic and are human. The term "wizard" is generally used to refer to male magic-users, while "witch" is used for female ones.
Wizards and witches are rare, with only a very small percentage of the world's population having the ability to perform magic. As such, they generally live in a hidden Wizarding world, separate from muggles. They have also developed their own culture and social norms.